Cooling Towers & Warm Water Systems

Cooling towers and warm water systems have been linked with the transmission of Legionnaires Disease which may in the worst case be fatal or at least, a serious and debilitating disease.

The Legionella organism multiplies at temperatures ranging from 20-45°C, with maximum growth occurring at between 32-43°C.  They can survive freezing but are killed with increasing rapidity as temperatures exceed 45°C. Survival time decreases from hours at 50°C to minutes at 60°C, while at 70°C the organism is destroyed almost immediately. 

It is important that the operators of cooling towers and warm water systems install, operate and maintain the systems in a clean condition at all times in accordance with the Australian Standard AS3666 1-3 Air Handling and Water Systems in Buildings.

Legionnaires disease reducing the risk at home Public Health Fact Sheet


Further Information

For more information please contact the Environmental Services team on 08 8563 8444.